Engineering Mechanics
The moment of a force

Is the turning effect produced by a force, on the body, on which it acts
All of these
Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

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Engineering Mechanics
According to Newton's first law of motion,

To every action, there is always an equal and opposite reaction
None of these
Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

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